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作为基于 CMake 的程序的配置步骤的一部分，我将程序下载到 CMAKE_BINARY_DIR 的子文件夹中，然后作为 add_custom_command() 的一部分调用它以在构建时生成一些源文件。

但是，在运行make构建项目时，进入自定义构建步骤时总是会收到此错误消息：

: program not found or is not executable
Please specify a program using absolute path or make sure the program is available in your PATH system variable

make使用标志重新运行VERBOSE=1以使其打印构建命令，我得到以下输出：

cd (directory) && (cmake_binary_dir)/path/to/tool (arguments...)
: program not found or is not executable
Please specify a program using absolute path or make sure the program is available in your PATH system variable

其中工具的路径是绝对路径CMAKE_BINARY_DIR

将完整的绝对路径复制到该工具并将其直接粘贴到我的终端中，可以使程序毫无问题地启动。

在这一点上，我不知道如何让 CMake 运行我的自定义构建阶段。有什么建议吗？

编辑：我的实际 add_custom_command 调用如下：

# at this point, PROTOC_COMPILER holds the path to protoc (inside the cmake build directory)
# PROTOBUF_FILES is the collection of .proto files I want to generate

message(STATUS "protoc path: ${PROTOC_COMPILER}")

foreach(PROTOFILE ${PROTOBUF_FILES})
    get_filename_component(PROTOFILE_DIR ${PROTOFILE} DIRECTORY)
    get_filename_component(PROTOFILE_NAME ${PROTOFILE} NAME_WE) # name without extension
    get_filename_component(PROTOFILE_ABSOLUTE_PATH ${PROTOFILE} ABSOLUTE)

    set(PROTOFILE_OUTPUT_HEADER_NAME "${FULL_OUTPUT_DIR}/${PROTOFILE_DIR}/${PROTOFILE_NAME}.pb.h")
    set(PROTOFILE_OUTPUT_SRC_NAME "${FULL_OUTPUT_DIR}/${PROTOFILE_DIR}/${PROTOFILE_NAME}.pb.cc")

    add_custom_command(
        OUTPUT "${PROTOFILE_OUTPUT_HEADER_NAME}" "${PROTOFILE_OUTPUT_SRC_NAME}"
        COMMENT "Compiling Protobuf file: ${PROTOFILE}"

        # make sure the output directory exists.
        COMMAND ${CMAKE_COMMAND} -E make_directory "${FULL_OUTPUT_DIR}/${PROTOFILE_DIR}"

        # actually generate the files. This is the command that fails.
        COMMAND ${PROTOC_COMPILER}
            --cpp_out="${FULL_OUTPUT_DIR}"  # where to put the output files.
            # make sure we can reference includes.
            # directory the $PROTOFILE is in. Otherwise protoc complains about it.
            -I${CMAKE_CURRENT_SOURCE_DIR}
            --grpc_out="${FULL_OUTPUT_DIR}"
            --plugin=protoc-gen-grpc="${GRPC_CPP_PLUGIN}"
            "${PROTOFILE_ABSOLUTE_PATH}" # the file to build

        DEPENDS "${PROTOFILE_ABSOLUTE_PATH}"
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    )

    list(APPEND GENERATED_HEADERS ${PROTOFILE_OUTPUT_HEADER_NAME})
    list(APPEND GENERATED_SOURCES ${PROTOFILE_OUTPUT_SRC_NAME})
endforeach()


add_library(my-project-protomessages STATIC ${GENERATED_SOURCES} ${GENERATED_HEADERS})
target_include_directories(my-project-protomessages PUBLIC ${FULL_OUTPUT_DIR})
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